National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

 | 

MERCED RIVER - YOSEMITE NP AT HAPPY ISLES (HPIC1)
Latitude: 37.73º NLongitude: 119.56º WElevation: 4017 Feet
Location: Mariposa County in CaliforniaRiver Group: San Joaquin
Monitor Stage: N/A Flood Stage: 7.5 Feet

Observed Data Credit
Gage owner logo

Raw streamflow data is provided by the US Geological Survey (USGS).
View USGS Data for this station location.

Historical Stage/Flow Data
Water Year
Peak Discharge (cfs)
Stage (feet)
Date
 Most Recent 5 Years
2023
4,980
8.42
May 23, 2023
2022
2,430
6.25
Oct 25, 2021
2021
1,410
5.02
May 7, 2021
2020
2,160
5.96
Apr 30, 2020
2019
4,240
7.79
Jun 13, 2019
 Historical High Stage/Flow Events (Period of Record - Aug 1915 to Present) - Ranked by Flow
1997
10,100
13.27
Jan 2, 1997
1956
9,840
12.73
Dec 23, 1955
1951
9,260
11.55
Nov 18, 1950
Location Photographs
ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ324)
Today: Mostly cloudy. Slight chance of rain early in the morning, then chance of rain in the late morning and afternoon. Near steady temperature in the mid 40s. West winds up to 10 mph. Chance of rain 50 percent.

Tonight: Rain likely in the evening, then rain likely and snow after midnight. Snow accumulation up to 1 inch. Snow level 5500 feet. Lows 32 to 38. West winds up to 5 mph shifting to the north after midnight. Chance of precipitation 80 percent.

Saturday: Rain and snow in the morning, then rain showers and snow showers in the afternoon. Snow accumulation up to 3 inches. Snow level 5300 feet. Highs 37 to 47. Southwest winds up to 10 mph. Chance of precipitation 90 percent.

Saturday Night: Rain and snow in the evening, then rain and snow likely after midnight. Moderate snow accumulations. Snow level 5300 feet. Lows 31 to 37. West winds up to 10 mph. Chance of precipitation 80 percent.

Sunday: Mostly cloudy. Chance of rain and snow in the morning. Highs 41 to 51. Southwest winds up to 10 mph. Chance of precipitation 50 percent.

Sunday Night: Mostly cloudy in the evening then clearing. Lows 33 to 39.

Monday: Warmer, sunny. Highs 56 to 66.

Monday Night and Tuesday: Mostly clear. Lows 41 to 47. Highs 60 to 70.

Tuesday Night and Wednesday: Partly cloudy. Lows 45 to 51. Highs 62 to 72.

Wednesday Night and Thursday: Mostly clear. Lows 46 to 52. Highs 65 to 75.
Flood Impacts
13.27 FeetFlood of Record: 1/2/97. $178 million in damage to Yosemite Valley.
10.0 FeetNorthside Drive at Wosky Pond, Southside Drive at Chapel Meadow, El Capitan crossover, and Sentinel crossover are impassable to vehicles.
8.2 FeetSwinging Bridge overtops. Water on road at Northside Drive, Southsie Drive, El Capitan crossover, and Sentinel crossover.
7.5 FeetFlood Stage. Housekeeping camp and Yosemite Valley backpacker campground begin to flood.
7.0 FeetNorth Pines and Lower Pines campgrounds begin flooding.
Product Disclaimer

This river graphic is not intended to serve as a substitute for official flood watches, warnings, advisories, or statements issued by the NWS San Joaquin Valley-Hanford Weather Forecast Office. Observations are preliminary and subject to change. River levels identified as "forecast" should be consistent with those contained in official NWS products. River levels identified as "guidance" have significant uncertainty due to future weather or reservoir regulation and are provided for planning purposes only.